// suport.js
class Container {
    static of(value) {
        return new Container(value)
    }
    constructor (value) {
        this._value = value
    }
    map (fn) {
        return Container.of (fn (this._value))
    }
}

class Maybe {
    static of (x) {
        return new Maybe (x)
    }
    isNothing () {
        return this._value === null || this._value === undefined
    }
    constructor (x) {
        this._value = x
    }
    map (fn) {
        return this.isNothing () ? this : Maybe.of (fn (this._value))
    }
}
module.exports = { Maybe, Container }